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I BEST AVAkLABLE COP (No Model.)

B. HEYWOOD.

COMMUTATOR FOR DYNAMO ELECTRIC MACHINES AND ELECTRIC MOTOR-S. No.399,329. Patented Mar. 12,1889.

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BENJAMIN HEYWOOI), ()h" NEW YORK, Y.

COMMUTATOR FOR DYNAMO-ELECTRIC MACHINES AND ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 399,329, dated March12, 1889.

Application filed May 11, 1888. Serial No. 273,554. (No model.)

To all (1'71 om. it may (fl/[(I'f'lll:

Be it known that Ll'iENJAUlN llrlYWool, a

' dueling-bars ol' melal 1/, with insulaling-bars eitizen oi the UnitedStales, residingin ihe 1 city, eounl'y, and Stale of New York, haveinvented a new and useful Imprm'ement in -Dynamos and llleotrie Motors,of which the tollowing' is a full, elear, and exael' deseriplion, takenin eonneelion with lhe aeeompze nyi n g d rawi n This invention relaleslo rotary brushes whieh are eansed lo roiale in (a'miaetwith the rolaryecanmuiaiors of dynamos and eleel-rie moiors by the rotary motion of thelatter and the friction of eonlae-t.

The prineipal object of the inyenlion is to cause such a brush to makecontact with one of. the metal bars of the commutator belfore it eeasesto be in ooniaetwith-t11e-nexlmt-l-he said bars, and thereby to obtain aeontinuons eurrent and prevent sparking; and to this end the improvement(-onsists in the combination of the eomn'mtator and a rotary brushhavingthe planes of the. bars of lhe eonunntator and the plane of theaxis of the brush obli ie to eaeh other at the. line of lheir eontact.

'lhe inveniion l'urlher eonsisls in eeriain eombinaiions, hereinafterdeseribed and elaimeihoi' whieh the rolary eonnnutalorand rotary oonlzwt brush mnstitnte. elmneuls In order to enable others skilled in theart to which my invention pertains to make and use the same, I will nowproeeedto deseribe its eonstruetiim and operation, referring to theaeeompanying drawings, whieh represent 'lhree dili'm-ent examples of myinvention.

Figure l. is a side- View, pa'rlly in se el ion, illustrating oneexample of my invention, showing a revolving eommnlalor, a portion o.l.-ils shall, one. of the slnul'i-bearings, the rotary brush and theroeker-arm whieh earrii it; and l ig. L is a plan eorresponding withFig. i. Fig'. I is a side. View, and Fig. -l a front. \'i(\\,illuslraiili another example of my inyentiou. Fig. 5 isjasido viewillustrating; a third example.

'Similar letters of reference designate eorre-. sponding parts in allthe figures.

Referring first to Figs. 1 and 2, A designates the shaft of the dynamoor motor, having upon it the eommut-ator A, which is formed in any usualor suitable manner of alternate conu inlerposed bel ween lhem.'llieseeomlueling' and insulating bars a u are supposed to he radial-tnthe axis oi the shall, as is usual in sneh eommuh-ilora l) designale-sone of the jourmil-boxes in whieh the shaft A rotales. l'pon aprolongation .of the journalbox 1') is pivoted vthe roeker-arm B, inthe.

outer end of which is earried'a pair of sliding pins, 1), on theexterior of whieh are springs b. li'pon the endoflhe sliding pins 1) isa yoke or sioe-k, having on one side a bent lateral arm, and in the endof this lateral arm is lirmly seeured a stud or axle, (1', on the. endof whieh-lurns freely the revolving; brush whieh is represei'ited asConsisting of. fl,llOV('l-\\'ll((l.fi[ melal having a smooth eoniealperipherywhi h bears against the eonieal l'aee oi' the oomiiiuial-or.The stud or axle in this example of my invention is oblique andtangential lo the axis of the commutator, as shown best in Fig. 2, andhence a planeiaken through the, axis of -tho brush at lhe. plaee ol. itseonlael; with the eolnnullalol is oblique. lo the plane of The springsh, before mentioned, always aot on ihe stock. (3 in press thorotarybrush against the eonunul-alor in the direel'ion of theaxis of thelatter; but I have also shown a S1ill|| 1,l',((lll('ll around the axleof'tho brush, between lhe arm and the brush, to press'lhe ialler in thedireelion of its own axis lo'ward lheeonunula-lor. 'lhe springs Ii and1' thus always preserve the mintaet between the rotary brush andeommul-aim', notwithsiamling wear. i

In the example shown in Figs. 3 and -l and in that shown in Fig. theoblique relation between the planes of the bars of the commutator andthe. planes of the axis of the ralary brush is obtained, while the axisof the eommuiaror and that of the brush are in the ,same plane by simplyarranging, the bars a a of the'comm'utator tangential to a circlesurstock' The effect of retaining always am; electrical contact with one0 f the g still, V the contact-with the next one-.isgfnlly inade isfullyiattained 'by ;this construction-of the jcommutator, as will 'beclearly noted -by ref-'1' xs erence to Fig. 4, where the line 8 oi}contact is indicated plainly bya strongrdottetl line; Nothing has beenherein saidiof theiproper' insulation of 'thejournal-bearing, therocker-- arm, 'dzc, as this forms no part of my inven ,b jti0n,'and is anecessary part of the construc-- ti'on of the machine commonlyknown'toa-ll jelectricians, and I do not'deemit necessary -to describeitin connection herewith. I What I claim as my invention, and desiresecure by Letters Patent, isi 1. The combination, in a-dynanio' or 'electric motor, of a rotary commutatorand a ro-,

BEST AVAILABLE COP tary hrush having the plane of the bars-of thecommutator and a plane taken through the axis of the brush at its pointof contact with the commutator oblique or diagonal to each other,substantially as and for the purpose herein described. i

2. In a dynamo or electric motor, the combination, with the rotarycommutator, a rov 'tary brush, and a rocker-arm for carrying said brush,of a springfor pressing the rotary brush in the direction of the line ofthe axis the -.co'mi nutato'r -for and into continuous "contact withthecommutator, substantially as 40 and for the purpose herein set forth.

ln'aflynamo orelec'tric motor, the combination, with the main shaft andthe rotary commutator thereon,'-of a rocker-arm, a mtary brush carriedby-the rockenarm, and a spring for pressing the said brush inthe-(iirection'of its own'axis into contact with the commutator,substantially as and for the purpose setforth.

BENJAMIN nsY'woon Withessesa QFREDK, HAYNES,

,HnNRit J; MOB- I E.

